From 4bb5d14f700c313dfaa3b5301611cbdeb31b3031 Mon Sep 17 00:00:00 2001
From: Ned Batchelder <ned@nedbatchelder.com>
Date: Fri, 8 Feb 2013 10:34:03 -0500
Subject: [PATCH] Test that we can't write files

---
 common/lib/codejail/codejail/tests/test_jailpy.py | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/common/lib/codejail/codejail/tests/test_jailpy.py b/common/lib/codejail/codejail/tests/test_jailpy.py
index ff9be079d1..d1133d745d 100644
--- a/common/lib/codejail/codejail/tests/test_jailpy.py
+++ b/common/lib/codejail/codejail/tests/test_jailpy.py
@@ -1,3 +1,5 @@
+"""Test jailpy.py"""
+
 import textwrap
 import unittest
 from nose.plugins.skip import SkipTest
@@ -53,6 +55,18 @@ class TestLimits(unittest.TestCase):
         self.assertNotEqual(res.status, 0)
         self.assertEqual(res.stdout, "")
 
+    def test_cant_write_files(self):
+        res = jailpy(dedent("""\
+                print "Trying"
+                with open("mydata.txt", "w") as f:
+                    f.write("hello")
+                with open("mydata.txt") as f2:
+                    print "Got this:", f2.read()
+                """))
+        self.assertNotEqual(res.status, 0)
+        self.assertEqual(res.stdout, "Trying\n")
+        self.assertIn("ermission denied", res.stderr)
+
     # TODO: write files
     # TODO: read network
     # TODO: fork